You must be new here. It doesn't even support "edit" which is breakthrough technology from the 1980s.
It's like a flashback to Unix ca. 1980 when you couldn't edit the command line if you made a mistake while typing a command.
I think the lack of an edit feature is due to the way that moderation works. They don't want someone to get modded up, then edit their post to something a bit more trollish. While it would be nice to be able to fix typos, that is a handy feature. Though they could of course allow you to view the revision history.